ISOLDE Technical Report

Richard CatherallISOLDE Technical Coordinator50th INTC meeting 1st July 2015

Outline• Target developments• REX Linac• RILIS• Ion Source and Beam Manipulation Development Team• Automatic Beam Tuning• Fast Tape Station

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Target Developments: Recent results• 8B beams

Ch. Seiffert, J. Balof, et al.

Target unit #499:- Target material: Carbon nanotubes (MWNCT),

ρ=0,43 g/cm3- Standard Ta container, cold transfer line, VADIS ion

source- SF6 in container,(0,37*10-4 mbar*l/s, p(SF6)~1-2

bar)

Release of 8B & ISOLTRAP’s MR-ToF:- No 8BFn

+ (n=1,2,3) or Oxyflourines detected- Positron activity on A=8 corresponds to 3*102 1/uC- Proof that activity originates from 8B still pending

Target unit #513 : (Same characterisics as #499,

higher SF6 injection)

Release of 8B & LA1 (Tengblad et al.):- 8BF3

+ (n=1,2,3) detected this time !- Positron activity on A=46 corresponds to

3x104-105/uC (~1nA stable contaminant also detected)

TaFx+ ion beams

Courtesy of T. Stora

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Target Developments: Recent results• Negative beams :

• Negative ion source prototype (GdB6 tube ion, Menna et al. NIMB, 266(2008) 4391)

Offline efficiencies 2015:e (Br-,I- ) = 17% @1700Cwith some questions remaining

Online TISD with Nb #535 and ThO #540 targets, starting this week

Y. Martinez, J. Ballof, T. Mendonca

Courtesy of T. Stora

Status of the refurbishment of the REX linac:Power converters and magnets ready for beam: New power converters for quads (19 units) fully functional New cooling water circuits for all the quads operational Electrical short in last triplet repaired and triplet refurbished Additional tests and measurements in other quadrupoles completed (thermal switches

characterized, temperature rise measured…)

RFQ amplifier output power for different settings in the control system (CCV)

RF systems: Maintenance and refurbishment of amplifiers for RFQ, IH

structure, buncher and 7 gap structures completed RFQ recalibrated and stable at 10 Hz, 1 ms / 40 kW pulses Buncher stable at 10 Hz, 1 ms / 1.4 kW pulses Temporary 9gap amplifier stable at 1Hz, 300 us, 45 kW RF power in 7 gap structures for a short period of time Connections to HIE-ISOLDE RF reference completed Power in the IH structure / long RF tests for the other

cavities delayed to week 27 Recalibration of rest of the cavities delayed to week 28 Ramp up in duty cycle delayed to week 28 Final 9gap amplifier schedule to arrive in week 31. Commissioning completed by week 35

Courtesy of J. A. Rodriguez Rodriguez

Status of the refurbishment of the REX linac:Vacuum systems: Scheduled maintenance completed. Faulty turbo pumps, controllers and gauges replaced Fast Penning gauges for fast acting valve to protect cryomodule installed Beam line connection to HIE-ISOLDE completed Update/upgrade of the control software scheduled for the winter shutdown

Beam re-commissioning started: Beam down to first diagnostics box (between RFQ and buncher)

Beam in FC after RFQ for different collimator aperture sizes (15, 5, 3 and 1 mm) MCP image of the beam after the RFQ

Controls: New low level controls functional (new power converters, RF amplifiers…) High level applications currently being updated (working sets and equipment arrays ready)

Courtesy of J. A. Rodriguez Rodriguez

doi:10.1016/j.nimb.2013.08.058Improved scanning software & DAQ

Hg (April ‘15, IS598)Au (May ‘15, IS534)‘On-call’ for most RILIS runs.

M.Sc. Thesis of R.E. Rossel

NB:Tisa

https://cds.cern.ch/record/2014923

New RILIS Remote Control Room

• RILIS Equipment Acquisition Control Tool (REACT) is being developed by Ralf Rossel.Courtesy of B. Marsh

New ionization scheme for Te

new AIS!

214 nm

902 nm

574nmhttp://cds.cern.ch/record/1319097/files/INTC-P-296.pdf

For:HIE-ISOLDE 116+118 Te Coulomb excitation

+ others

New possibility of clean tellurium beams at ISOLDE

PhD work: T. Day Goodacre

Courtesy of B. Marsh

VADLIS: demonstrated for Ga, Ba, Ba2+, Hg, Cd

http://ecos-eurisol14.sciencesconf.org/conference/ecos-eurisol14/pages/Marsh_RILIS_FEBIAD_BM_1.pdf

• First on-line RILIS ion beams from liquid targets (Cd from Sn and Hg from Pb)• Up to 2x efficiency improvement observed for Hg and Cd (compared to VADIS only)• Higher purity Ba beams compared to Surface + RILIS source

Courtesy of B. Marsh

Ion source & ion beam

manipulationR&D

Schemedevelopment

Laserdevelopment

RILISoperation

Laserspectroscopy

Targetdevelopment

Targetconstruction

Target operation

Technical coordination

of ISOLDE

EN/STILP

EN/STIRBS

A highly effective means of improving ISOLDE performance

Efficiency Selectivity Beam quality

With reduced radioactive waste inventory(essential for HIE ISOLDE)

Reliability

There is room for improvement of

LIST

RILIS selectivityFast beam gating

Ion beam multiplexing

ISCOOL upgrades

Optical pumping

FEBIAD optimzationVADLIS

ToFLISHRS upgrade

To tackle subjects such as

New Ion Source (and beam manipulation) Development Team

Automatic Beam Tuning• Nelder-Mead simplex algorithm applied directly to the hardware• An automatic robust optimisation program for tuning the beam

through complex systems.• Faster and less tedious for the operator

Jake Palmer & T. Giles

Fast Tape Station• A final design is now in place and production drawings in

progress• Procurement of parts already started• Construction and detector development this autumn• On-line commissioning (at LA2?) as from 2016• Final installation 2016/2017 shutdown• A spare tape station to be built• Excellent support throughout EN

E. Grenier-Boley

• Thank you for your attention